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In [[1922]] the company acquired the building in Via Ca 'Erizzo in Bassano Veneto, later expanded and renovated, that still is the headquarter of the company. In [[1925]] the company was bought by Alessandro Marzotto and Domenico Manea, and the following year was renamed as ''"Industria Pennini Oro e Penne Stilografiche Elmo"'' which acronym, ''I.P.O.P.S.E.'', was marked on the nibs until the first half of the '30s.  In this same year was the application for ''Elmo'' ({{Marchio|32293}}) and ''Montegrappa'' ({{Marchio|32168}}) trademarks registration which suggests an entry on the fountain pen market occurred around this period, since the trademark ''Elmo'' was property, at least until 1922 (see [[:File:1922-Elmo-Safety.jpg|this advertisement]]) of another company.  Despite the new ownership ''Heinrich Helm'' continued to be the production director, providing a vital contribution to the success of the company.

In [[1922]] the company acquired the building in Via Ca 'Erizzo in Bassano Veneto, later expanded and renovated, that still is the headquarter of the company. In [[1925]] the company was bought by Alessandro Marzotto and Domenico Manea, and the following year was renamed as ''"Industria Pennini Oro e Penne Stilografiche Elmo"'' which acronym, ''I.P.O.P.S.E.'', was marked on the nibs until the first half of the '30s.  In this same year was the application for ''Elmo'' ({{Marchio|32293}}) and ''Montegrappa'' ({{Marchio|32168}}) trademarks registration which suggests an entry on the fountain pen market occurred around this period, since the trademark ''Elmo'' was property, at least until 1922 (see [[:File:1922-Elmo-Safety.jpg|this advertisement]]) of another company.  Despite the new ownership ''Heinrich Helm'' continued to be the production director, providing a vital contribution to the success of the company.

[[Image:Montegrappa-RedBrown-Posted.jpg|thumb|A ''Montegrappa'' in celluloid]]

[[Image:Montegrappa-RedBrown-Posted.jpg|thumb|A [[Montegrappa]] in celluloid]]

Between the late '20s and early '30s were introduced the first celluloid models, the first ones were equipped with a [[button filler]] but later also a [[lever filler]] was used. Initially these were matched to the in hard rubber models and then they replaced them. Moreover the production was also differentiated, using the ''Elmo'' brand to mark the low end economic pens, while the ''Montegrappa'' brand was used for the top level pens.  

Between the late '20s and early '30s were introduced the first celluloid models, the first ones were equipped with a [[button filler]] but later also a [[lever filler]] was used. Initially these were matched to the in hard rubber models and then they replaced them. Moreover the production was also differentiated, using the ''Elmo'' brand to mark the low end economic pens, while the ''Montegrappa'' brand was used for the top level pens.